Slip for overshots



'March 31, 1925. 1,531,450

' y H. M. MYRACLE ET AL SLIP FOR OVERSHOTS Filed De'. 9, 1924 Patented Mar. 31, 1925. y UNITED STATES 1,531,450 lPATENT OFFICE.

HOBART M. MYRACLE, EDWARD G. REIGHNER, AND JOHN F. CAILLOUX, TONKAWA, OKLAHOMA, ASSIGNORS TO AMERICAN IRON & MACHINE WORKS ING., OF TON KAWA, OKLAHOMA, A CORPORATIONOF OKLAHOMA.-

SLIP FOR OVERSHOTS.

Application filed December 9, 1924. Serial No. 754,834.

T 0 all whom may concern. I Be 1t known that we, HoBAn'r M. Mrnaonn, EDWARD G. REIGI-INER, and JOHN F. GAIL- Loox, citizens of the United States. residing' #725,226, on releasing hook overshots, andthe invention particularly relates to the construction of the :toothed slips which are locatedwithin the rotary .ishing tool and which are adapted to engage with a broken drill pipe and lift the same when the fishing tool is pulled upward.

' In the construction illustrated in the prior application above referred to,there is shown a fishing tool or overshot having a cylindrical body portion having a downwardly tapering seat. upon which are disposedtwo semi-circular slips, theinterior of the slips.`

being formed with bat-winged left-handed screw-threads, and above these slips is disposed a rubber ring which constitutes not only a packing ring for the slipsbut also a resilient means for urging the slips downward against the seat.

The object of the present invention is to improve upon the slips as illustrated by so forming the slips that they have interlocking engagement with each other so as to form a more perfect seal in retaining circulation through the drill pipe which is being lifted, and further to prevent the slips from see-sawing or one rising higher than the other when only one of the slips happens to come in contact with the pipe being fished for, this construction also forming a better seat for the rubber packing ring immediate- 1y above it.

Our invention is illustrated in the accompanying drawing, wherein Figure 1 is a longitudinal sectional' view of an overshot constructed in accordance with the invention disclosed 1n the vprior ap@ plication above referred to but with my improved slips mounted therein;

Figure 2- is a section on the line 2-2 of Figure 1;

Figure 3 is a section on the line 3 3 of Figure 1;

Figure 4 is a perspective view of one of the slips; o

Figure 5 is a perspective view of the complementary slip.

Referring to the drawing, 10 designates the cylindrical body portion of the overshot which is downwardly extended at. its lower end ecceutrically to the body, as at 11. This body terminates ina lateral grab hook 13. This hook 13 is angularly disposed with rei"- erence to the longitudinal axis'of the fishing tool. The middle of the body 10 is formed with opposed downwardly tapering seats 14 separated from cach other by downwardly inclined keys 15. T hese keys 15 are rigidly fastened opposite each other but the keys are less' in height than the height of the seat 14.

Immediately above this.l tapered portion 14 the wall is cylindrical so as to receive within it the rubber ring 1G, and above this portion within which the rubber ring seats the interior of the body vis interiorly screwthreaded, as at 17. So far, except for the detailed construction of the keys, I have described what is illustrated in the prior* application.

Disposed against the seats 14 andI on'each side o'f' the keys 15 are theltwo slips 18. These slips are semi-circular in cross section, as illustrated in Figure 4, and each slip is. of course, tapered. The interior of each slip is formed with bat-winged left-handed screw-threads 19. Each slip is cut away at one edge from its bottom upward, as at 20, this cut-away portion being defined at its upper end by a transversely extending shoulder 21. The opposite edge of the slip is cut away from the upper end of the slip downward, as at 22, the lower edge of this cut-away portion being defined by a shoulder 23. This cut-away portion 22 has a depth equal to the depth of the portion 24 diametrically opposite.

When. the slips arey placed together, as shown in Figure ,1, and the portion 24 is inserted in the cut-away portion 22 the'end wall of the slip below the cut-away ortion 22 together with the end wall of t e cutaway portion 20 dene two openings which receive the keys 15, as shown in Figure 3. The portions 24, however, overlap the shoulder 23 so that there is 'an interlocking en gagement between the slips, and if one slip rises the other slip rises, and if one slip falls the other slip falls. Thus the slips while they can expand or move outwardly independently of each other are conjoined for simultaneous upward or downward movement. The upper portion of the body is interiorly screw-threaded for the reception of the lower end of the drill pipe 25.

Vith the construction as heretofore described, the tool is run into the hole until the top of the pipe being fished for is found. The fishing tool is then turned to the right until the hook 12 has engaged the upper end of the broken drill pipe and shifted it to t-he center of the hole. Then the tool is lowered so that the upper end of the pipe being ished for will enter the bowl or body 10. The slips 18 will rise up in the bowl against the action of the 4rubber ring 16 when the slips come in contact with the broken pipe, allowing the pipe to pass on upward through the body or bowl. When the fishing tool has -telescoped upon the pipe being fished for to a suflicient extent, the

tool is pulled upward and the slips willy move downward, grasping the broken pipe. The pipe is then drawn out of the hole and released- As the slips have bat-winged lefthanded screw-threads and as these slips must rotate with the body of the tool, it is obvious that the slips will unscrew from the drill pipe when the tool is turned to the right.

By making the ring 16 of rubber, the ring serves as a packer to keep the return flow of fluid on the outside of the pipe and after hold has been taken on the broken pipe it vfacilitates c irculation through the broken In the construction described in the priorI application, one of the difficulties was that body the slips were inclined to raise unequally inasmuch as they were -not interdigitated orv had interlocking connection with each other. Thus one slip would rise higher than the other when onl one came in contact with the pipe being shed for. This is obviated in the present construction, as before' stated. Furthermore, inasmuch as both slips rise together, they form a better seat for the rubber packing ring and have better engagement with this rubber packing ring, and as the slips overlap across the top of the ribs .or keys 15, it is obvious that a much better seal will be formed to retain circulation.

We claim 1. A fishing toolv comprising a hollow body, a pluralit of slips arranged within the body and a apted for gripping an object to be recovered, each oi said slips having an upwardly and outwardly inclined outer face, thehollow body having an inclined seat for said slips to rest upon, vertically'extending keys arranged -on the seat, each of' said slips beingacut away on one end from t'he lower endv of the slip upward a distance equal to the height of one of said keys and at its other end being cut away from the top of the slip downwarda distance equal to the uncutaway portion of the other end of the slip and adapted toV receive the uucutaway portion of the next adjacent slip whereby the slips have interlocking engagement with each other for simultaneous upward or downward movement.

`2. A fishing tool comprising a hollow having a downwardly and centrally inclined Seat, a plurality of segmental slips arranged within -the body, the slips having upwardly and outwardly inclined outer faces engaging said seat and vertical inner faces, each slip having a peripherally extending portion overlappin an adjacent peripheral portion of the a jacent slip in a horizontal plane whereby to cause said slips to move together vertically.

In testimony whereof we hereunto affix our signatures.

HOBART M. MYRACLE. lEDWARD e. REIGHNER. JoHNIF. CAILLOUX. 

